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EMPLOYEE BENEFIT PLANS

Deferred Compensation Plan

The Company maintains an Officer Deferred Compensation Plan that permits key officers to defer a portion of their compensation. The plan is nonqualified and funded. The Company has established a separate account for each participant, which is invested and reinvested from time to time in investments that the participant selects from a list of eligible investment choices. Earnings and losses on the book reserve accounts accrue to the plan participants. Liabilities for the plan are included in other long-term liabilities, and the corresponding investment accounts are included in other assets. Aggregate amounts deferred under the plans were $2.4 million and $2.1 million for the years ended December 31, 2014 and 2013, respectively.

Incentive Compensation

The Company has an incentive compensation plan for non-executive employees. The plan allows the Company to pay up to 8.25% of earnings before tax upon achieving a specified earnings threshold. The Company also has an executive/senior management plan for certain corporate and business unit management employees. Under this plan, the bonus is a percentage of each participating employee’s base salary based upon the Company’s achievement of the financial target established by the Board of Directors at three levels – a threshold level, a target level, and a stretch level, subject to a positive or negative adjustment for the Company’s safety performance. Pursuant to these plans, the Company accrued incentive compensation expense of $11.7 million, $11.5 million, and $6.0 million for the years ended December 31, 2014, 2013, and 2012, respectively. We also have a Safety Incentive Plan related to Occupational Safety and Health Administration recordable incidents, for which we expensed and paid $1.0 million, $1.0 million, and $0.9 million for the years 2014, 2013, and 2012, respectively.

401(k) Plan

We sponsor a 401(k) Plan (“Plan”) for our employees. An employee is eligible to participate in the Plan immediately upon employment and receive a dollar matching contribution up to 6% of his or her base compensation. The vesting for matching contributions is 25% per year beginning at the end of the second year of employment. Employees are fully vested after completing five years of service to the Company. The matching contribution for the years ended December 31, 2014, 2013, and 2012 were $11.5 million, $10.5 million, and $9.0 million, respectively.